Glass-pressing apparatus.



No. 670,764. Patented Mar.26, 190i W. BUTTLER. GLASS PBESSING APPARATUS.

(Application filed July 2,1900.)

(No Model.)

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UNITED STATES PATENT OFFICE- WILLIAM BUTTLER, OF REDKEY, INDIANA.

GLASS-PRES SING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 670,764, dated March 26, 1901.

Application filed July 2, 1900. derial No. 22,249. (No model.)

To (I/ZZ whom it may concern.-

Be it known that 1, WILLIAM BUTTLER, of Redkey, in the county of Jay and State of Indiana, have invented a new and useful Improvement in Glass-Pressing Apparatus, of which thefollowing is a full, clear, and exact description, reference being bad to the accompanying drawings, forming part of this specification, in which Figure l is a sectional side elevation show ing one form of apparatus constructed in accordance with my invention, and Fig. 2 is a sectional front elevation of the same.

My invention relates to the pressing of glass blanks or articles, and it is designed to do away with skilled labor for this purpose and provide mechanism for automatically retracting the pressing mechanism after the operation of pressing is carried out, and, further, to automatically eject the pressed blank or article.

In the drawings, 2 2 represent the standards of a glass-press having its mold 3 carried upon the hollow piston-rod 4 of a pneumatic cylinder 5, suitably supported in a bed-plate 6.

The hollow piston-rod 4 is provided with a continuation 4' upon the opposite side of the piston, which extends through a stulfing-box 7 at the lower end of the cylinder 5. An ejectorrod 8 extends through the hollow piston-rod and is provided at its upper end with an ejector 9, which fits neatly in the bottom of the mold-cavity.

Air is supplied to the lower end of the cylinder 5 through a pipe 10, the supply being controlled by a three-way cook or plug 11, which is provided with a foot-lever 12, by which the valve is turned to admit air to the cylinder. This foot-lever is connected by means of a long link 13 with a cross-head 14, secured to the plunger-stem 15, which carries the plunger 16 of the press. The upper end of the link or rod 13 is provided with an ad justable nut 17, which may rest upon or be moved above the cross-head. This crosshead is provided with the usual depending stems 18, carrying the mold-ring 19, springs 20 being interposed between the ring and cross-head.

The plunger-stem 15 extends through the topplate 21 of the press and is provided with a nut 22 and with a spring 23, which is compressed between the cross-head 14 and the top plate 21. The tension of this spring may be regulated by adjusting the nut 22 and the position of the cross-head relatively to the mold may be adjusted by the screw-threaded hollow plug or nut 24, through which the plunger-stem loosely extends.

The base-plate 25 of the machine is provided with a hole which the ejector-rod 8 may enter, and this hole is normally covered by a horizontally-swinging lever 26, pivoted at 27 and having the upward projection 28, by which the operator may swing it. A spring 29 normally holds this lever to close the hole, so that the ejector-stem will contact with it as the piston is lowered in the cylinder. justable stop 30 is provided to limit the downward movement of the foot-lever, and thus stop the valve at the proper point for admission of air.

The operation of the device is as follows: The lever 26 being moved to one side, the mold is lowered to its normal position; as shown in dotted lines in Fig. 1, with the ejecting'block fitting in its bottom and the spring holding the lever 26 against the side of the ejector-rod. A suitable quantity of molten glass being dropped into the mold, the operator depresses the foot-lever, and thus admits compressed air beneath the piston in the cylinder. The mold is thus forced upwardly and presses the glass around the plunger in the usual manner, the spring 23 having sufficient power to allow the necessary pressure to be applied in shaping the article. After the pressing of the article is completed the pressure in the cylinder overcoming the resistance of this spring 23 moves up the entire plunger and stem with the cross-head 14 for a short distance, say a quarter or half an inch. As the cross-head moves up it strikes the nut 17 on the link 13, and thus lifts the footlever and connects the cylinder with the exhaust through the ports in the valve 11. The friction of the valve will hold it in this position and the mold immediately begins to lower and will drop to its normal place. As the mold and piston move down the ejector-stem An adstrikes the top face of the lever 26, and in the further downward movement of the mold the article is ejected, the parts assuming the position shown in Fig. 2. The article then being lifted ofi, the lever 26 is pushed to one and arrangement of the machine without departing from my invention, sinceI consider myself the first to automatically retract the pressing mechanism by the yielding of the cylinder or the plunger.

I claim- 1; A glass pressing apparatus having a plunger and mold, one of which is yieldingly mounted, mechanism for actuating the other to press the glass, and connections with the yieldingly-mounted member arranged to allow the other member to automatically retract after the pressing operation; substantially as described.

2. A glass-pressing apparatus having'a plunger and a mold, one of which is yieldingly mounted, a motive cylinder arranged to actuate one of said elements to perform the pressing operation, and a valve for the cylinder having connections with the yielding member arranged to allow the reverse movement of the pressing element; substantially as described.

3. A glass-press having a yieldingly-mounted plunger, a mold mounted upon the piston-rod of a motive cylinder, a valve controlling the supply to the cylinder, and a connectionto the valve arranged to be actuated by the movement of the plunger after pressing, substantially as described.

4. In a glass-press, a vertically-movable mold carried upon the movable element of the motive cylinder, the piston and piston-rod of the cylinder being hollow, and a rod extending through said hollow piston-rod and having an ejector within the mold; substantially as described.

5. In aglass-press, a motive cylinder, a vertically-movable mold carried on the movable element of said cylinder, and an ejector within the mold having a rod extending downwardly through the cylinder; substantially as described.

In testimony whereof I have hereunto set my hand.

WILLIAM BUTTLER.

Witnesses:

WILLIAM A. DRAGOO, GEO. H. ENGLE. 

